Abstract: Objective To identify antigens which may help evaluate the therapeutic effect of angiostrongyliasis from adult worm antigen of Angiostrongylus cantonensis.Methods The adult worm antigens of A.cantonensis were analyzed by Western blotting with the sera of rats infected with A.cantonensis before and after treatment.The sera of rats were tested by enzyme-linked immunosorbent assay(ELISA).Results The antigens with relative molecular mass between 38 000 and 78 000 reacted not only with the sera of rats before treatment,but also with that after treatment.The antigens with Mr between 190 000 and 17 000 reacted with the sera of rats before treatment but not with that after treatment;those with Mr between 32 000 and 24 000 antigens strongly reacted with the former,but the reaction became much weakened with the latter.The AC32-IgG antibody appeared earlier than the AC-IgG,and disappeared rapidly after treatment.Six of the 10 treated rats became negative for AC-IgG as found by ELISA.Conclusion The antigens of adult worm antigen of A.cantonensis with Mr of 190 000,32 000,24 000,17 000 and 16 000 may serve as candidate antigens for therapeutic effect evaluation of angiostrongyliasis.